公开(公告)号：US20240002744A1

公开(公告)日：2024-01-04

申请号：US18253795

申请日：2021-12-16

Applicant: SHELL OIL COMPANY

Inventor： Leonard Joachim KIECKEBUSCH ,  Christopher Claus DOBROWOLSKI

IPC: C10M169/04 ,  C10M105/34 ,  C10M105/42 ,  C10M129/70 ,  C10M155/02 ,  C10M145/14 ,  C10M157/10 ,  C10M161/00

CPC classification number: C10M169/044 ,  C10M105/34 ,  C10M105/42 ,  C10M129/70 ,  C10M155/02 ,  C10M145/14 ,  C10M157/10 ,  C10M161/00 ,  C10M2207/2815 ,  C10M2207/301 ,  C10M2229/02 ,  C10M2209/084 ,  C10N2020/081

Abstract: Implementations of the disclosed subject matter provide a lubricating composition for use as a transmission fluid in an electric vehicle. The lubricating composition may include at least 70 wt %, based on the overall weight of the lubricating composition, of a biodegradable ester base oil with a kinematic viscosity at 100° C. in the range of 2.5 to 7.0 mm2/s. The ester is biodegradable according to OECD test guidelines series 301. The composition may also include at least 0.5 wt % and no more than 10 wt %, based on the overall weight of the lubricating composition, of a viscosity index improver which is at least one high viscosity ester with a kinematic viscosity at 100° C. of at least 1000 mm2/s; an anti-foam additive selected from silicone oil based antifoam additives and polyacrylate antifoam additives. Also disclosed is a process for lubricating an electric vehicle drive train comprising a transmission by applying the lubricating composition to the transmission.